My english is not good, so I beg your pardon in advance for my mistakes,

I’m a newbie so forgive me for inaccuracies,

I have previously searched and tried the solutions I found on the internet but still I can not solve the problem of embedding a prepopulated database.

____ THE GOAL

I want to develop an app for iOS and Android with a prepopulated database.

Just for example, the database consists of 15.000 records each one made of three key-value pair (id, firstname and lastname). I still do not know what is the best solution: JSON or SQLite?
(Could you give me an answer here?)